No its not, the 1st 3 digits at least are wrong.
I think it should be A203 870 33 89 - and you need the glove compartment holder, screws, power and fibre cables.
However, there is often an accesory part number starting with B6 that can be cheaper than buying the Axxx part number
Theres description on how to fit CD changer into A class on
www.mercupgrades.com - part numbers are different but basics are same - may be of some use to you !
I think the parts you need are
1x CD changer (above)
2x most fibre cable (see my doc)
4x screws N000000 001955
1x power cable A203 540 32 34
1x glovebox braceket A203 820 07 14
1x screw for above A001 984 64 29
R
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Of course i'll take it apart.
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